Display substrate and display device

ABSTRACT

The present disclosure provides display substrate and display device, and belongs to the field of display technology. The display substrate of the disclosure has mounting region, first display region adjacent to mounting region, and second display region surrounding first display region and/or mounting region. The display substrate comprises: substrate; driving circuit layer on substrate and comprising pixel driving circuits in first display region and second display region, and arrangement density of pixel driving circuits in second display region is less than that of pixel driving circuits in second display region; and light emitting devices in mounting region, first display region, and second display region, first electrode of each light emitting device being electrically coupled to a corresponding pixel driving circuit, and pixel driving circuit electrically coupled to first electrode of light emitting device in the mounting region being located in first display region.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a National Phase Application filed under 35 U.S.C.371 as a national Stage of PCT/CN2020/124401, filed on Oct. 28, 2020, anapplication claiming the priority of the application PCT/CN2020/119673,filed on Sep. 30, 2020, the contents of which are incorporated herein byreference in their entirety.

TECHNICAL FIELD

The present disclosure relates to the field of display technology, andparticularly relates to a display substrate and a display device.

BACKGROUND

With the advance of science and technology, special-shaped screens andfull-screen screens have gradually come into people's vision in recentyears. The special-shaped screens and the full-screen screens areadopted to improve the screen-to-body ratio of the display device. Then,in order to achieve a higher screen-to-body ratio, some open regions(e.g., holes) need to be reserved for some additional components (e.g.,cameras, sensors, etc.) at some locations on the display screen.

With the development and update of display technologies, the organiclight emitting display (OLED) has become a mainstream product in thedisplay field due to its characteristics such as self-luminescence, highbrightness, high contrast, low operating voltage, and capability offorming flexible displays.

SUMMARY

The present disclosure aims to solve at least one of the technicalproblems in the prior art and provides a display substrate and a displaydevice.

An embodiment of the present disclosure provides a display substratehaving a mounting region, a first display region adjacent to themounting region, and a second display region surrounding the firstdisplay region and/or the mounting region, wherein, the displaysubstrate includes:

a substrate;

a driving circuit layer on the substrate and including a plurality ofpixel driving circuits, the plurality of pixel driving circuits being inthe first display region and the second display region, and anarrangement density of the pixel driving circuits in the second displayregion is less than that of the pixel driving circuits in the seconddisplay region; and a plurality of light emitting devices in themounting region, the first display region, and the second displayregion, a first electrode of each light emitting device beingelectrically coupled to a corresponding one of the pixel drivingcircuits, and the pixel driving circuit electrically coupled to thefirst electrode of the light emitting device in the mounting regionbeing located in the first display region.

In an embodiment, the display substrate further includes:

a plurality of data lines in the first display region and the seconddisplay region, each pixel driving circuit being electrically coupled toa corresponding one of the data lines;

wherein in the first display region, a distance between nodes at whichtwo pixel driving circuits adjacent in a first direction arerespectively coupled to corresponding data lines is d1; in the seconddisplay region, a distance between nodes at which two pixel drivingcircuits adjacent in the first direction are respectively coupled tocorresponding data lines is d2; and d1 is less than d2.

In an embodiment, the plurality of light emitting devices includes aplurality of light emitting device groups arranged along the firstdirection, the light emitting devices in each of the plurality of lightemitting device groups are arranged along a second direction; and thepixel driving circuits coupled to the first electrodes of the lightemitting devices in a same light emitting device group are coupled to asame data line.

In an embodiment, at least part of the plurality of data lines includesportions in different layers.

In an embodiment, at least part of the plurality of data lines includesa bend line.

In an embodiment, at least one of the data lines which is the bend lineis a first data line; the first data line includes a first sub data linesegment directly coupled to the pixel driving circuit for driving atleast part of the light emitting devices in the mounting region, and asecond sub data line segment directly coupled to the pixel drivingcircuit for driving at least part of the light emitting devices in thesecond display region; and at least portions of the first sub data linesegment and the second sub data line segment are not on a same straightline.

In an embodiment, the first data line further includes a third sub dataline segment directly coupled to the pixel driving circuit for drivingat least part of the light emitting devices in the first display region;and at least portions of the first sub data line segment and the thirdsub data line segment are not on a same straight line.

In an embodiment, the first sub data line segment includes a portionthat is substantially in parallel with the second and third sub dataline segments.

In an embodiment, the first and second sub data line segments includedifferent materials, and/or the first and third sub data line segmentsinclude different materials.

In an embodiment, the second sub data line segment includes a firstportion and a second portion respectively disposed at two opposite sidesof the mounting region along a second direction; the first data linefurther includes a first transfer electrode and a second transferelectrode respectively arranged at the two opposite sides of themounting region along the second direction, and

the first sub data line segment is electrically coupled, on a first sideof the mounting region along the second direction, to the first portionof the second sub data line segment through the first transferelectrode; and the first sub data line segment is electrically coupled,on a second side of the mounting region along the second direction, tothe second portion of the second sub data line segment through thesecond transfer electrode.

In an embodiment, the first and second transfer electrodes includeportions which are substantially in parallel with each other.

In an embodiment, a length of at least part of the first transferelectrode along the first direction is substantially the same as alength of at least part of the second transfer electrode along the firstdirection.

In an embodiment, the display substrate further includes:

-   -   a second conductive layer on the substrate and including the        first and second transfer electrodes extending in the first        direction;    -   a second insulating layer on a side of the second conductive        layer away from the substrate;    -   a third conductive layer on a side of the second insulating        layer away from the second conductive layer and including the        first sub data line segment, the second sub data line segment,        and the third sub data line segment extending along a second        direction.

In an embodiment, the pixel driving circuits in the first display regioninclude a plurality of first pixel driving circuit groups arranged in afirst direction; the pixel driving circuits in the second display regioninclude a plurality of second pixel driving circuit groups arrangedalong the first direction; the plurality of first pixel driving circuitgroups each include a plurality of first pixel driving circuits arrangedin a second direction, and the plurality of second pixel driving circuitgroups each include a plurality of first pixel driving circuits arrangedin the second direction;

the plurality of light emitting devices constitute a plurality of lightemitting device groups arranged in the first direction, and the lightemitting devices in each of the plurality of light emitting devicegroups are arranged in the second direction; and the plurality of lightemitting device groups include M mounting-region light emitting devicegroups, at least one light emitting device of each mounting-region lightemitting device group being located in the mounting region;

the plurality of first pixel driving circuit groups include M firstsub-pixel driving circuit groups, the pixel driving circuits in each ofthe M first sub-pixel driving circuit groups are arranged along thesecond direction; and M is an integer greater than or equal to 2; and

the first electrode of the at least one light emitting device of an i-thmounting-region light emitting device group in the mounting region iscoupled to the pixel driving circuits in an i-th first sub-pixel drivingcircuit group in a one-to-one correspondence by signal connection lines,and i has a value from 1 to M.

In an embodiment, the first display region includes a first sub displayregion and a second sub display region which are oppositely arranged inthe first direction; the first sub-pixel driving circuit groups arearranged in the first sub-display region and the second sub-displayregion; and a ratio of the closest distance from at least one firstsub-pixel driving circuit group located in the first sub-display regionto an edge of the mounting region, to the closest distance from at leastone first sub-pixel driving circuit group located in the secondsub-display region to an edge of the mounting region ranges from 0.8 to1.2.

In an embodiment, a 1^(st) to an M-th light emitting device groups aresequentially arranged in a direction from the first sub display regiontowards the second sub display region; a 1^(st) to an (M/2)-th firstsub-pixel driving circuit groups are in the first sub-display region andare sequentially arranged in the first direction along a direction awayfrom the mounting region; an M-th to an (M/2+1)-th first sub-pixeldriving circuit groups are in the second sub-display region and aresequentially arranged in the first direction along the direction awayfrom the mounting region.

In an embodiment, the display substrate further includes: a secondconductive layer on the substrate; and the second conductive layerincludes a reset power signal line, a first plate of a storage capacitorand the signal connection lines correspondingly coupled to the pixeldriving circuits in the 1^(st) and M-th first sub-pixel driving circuitgroups.

In an embodiment, the display substrate further includes:

-   -   an active semiconductor layer, including a channel region and a        source/drain doped region of each transistor of each of the        plurality of pixel driving circuits, and the plurality of pixel        driving circuit each at least including a driving transistor, a        data writing transistor, a storage capacitor, a threshold        compensation transistor, a first reset transistor, a second        reset transistor, a first light emission control transistor and        a second light emission control transistor;    -   a gate insulating layer on a side of the active semiconductor        layer away from the substrate;    -   a first conductive layer on a side of the gate insulating layer        away from the active semiconductor layer, the first conductive        layer including a second plate of the storage capacitor, a scan        signal line, a reset control signal line, a light emission        control signal line, and control electrodes of the driving        transistor, the data writing transistor, the threshold        compensation transistor, the first light emission control        transistor, the second light emission control transistor, the        first reset transistor, and the second reset transistor, the        control electrode of the driving transistor being reused as the        second plate of the storage capacitor;    -   a first insulating layer on a side of the first conductive layer        away from the gate insulating layer, the second conductive layer        being on a side of the first insulating layer away from the        first conductive layer;    -   a second insulating layer on a side of the second conductive        layer away from the first insulating layer; and    -   a third conductive layer on a side of the second insulating        layer away from the second conductive layer, the third        conductive layer including a first power signal line, at least        part of data lines and a first sub-transfer part; the first        sub-transfer part being electrically coupled to a second        electrode of the second light emission control transistor.

In an embodiment, the first display region further includes a thirdsub-display region and a fourth sub-display region oppositely disposedin the second direction; in the third sub-display region and the fourthsub-display region, a distance between reset control signal lines towhich two adjacent pixel driving circuits in the second direction arecoupled is d3; in the second display region, a distance between resetpower supply signal lines to which two adjacent pixel driving circuitsin the second direction are coupled is d4, and d3 is smaller than d4.

In an embodiment, the display substrate further includes:

a transparent conductive layer, at least including the first electrodeof the light emitting device in the mounting region, and the signalconnection lines correspondingly coupled to the pixel driving circuitsin at least some first sub-pixel driving circuit groups among a 2^(nd)to an (M−1)-th first sub-pixel driving circuit groups.

In an embodiment, the first sub-pixel driving circuit groups areuniformly arranged along the first direction in the first sub-displayregion and the second sub-display region.

In an embodiment, the display substrate further has a transition regionsurrounding the first display region and located between the firstdisplay region and the second display region; the plurality of lightemitting devices include a light emitting device in the transitionregion, and a pixel driving circuit to which the first electrode of thelight emitting device located in the transition region is coupled islocated in the first display region.

In an embodiment, the display substrate further includes: a pixeldefining layer on the substrate, the pixel defining layer includingpixel openings in one-to-one correspondence with the first electrodes ofthe plurality of light emitting devices;

in the first display region, sizes of the pixel openings correspondingto the first electrodes of the light emitting devices emitting lightwith a same color are substantially the same, in the second displayregion, sizes of the pixel openings corresponding to the firstelectrodes of the light emitting devices emitting light with a samecolor are substantially the same, and in the mounting region, sizes ofthe pixel openings corresponding to the first electrodes of the lightemitting devices emitting light with a same color are substantially thesame; and

among the pixel openings corresponding to the first electrodes of thelight emitting devices emitting light with the same color, the size ofeach pixel opening in the mounting region is not larger than the sizesof the pixel openings in the first display region and the second displayregion.

In an embodiment, among the light emitting devices in the mountingregion, the first display region, and the second display region, thepixel driving circuits for the light emitting devices in a same regionand arranged in a second direction are arranged in the second direction.

In an embodiment, a ratio of an area of a pattern of an activesemiconductor layer in the first display region to an area of the firstdisplay region is larger than a ratio of an area of a pattern of anactive semiconductor layer in the second display region to an area ofthe second display region.

In an embodiment, ratios of respective light emission areas of at leasttwo of the first display region, the second display region, and themounting region to respective total areas of the at least two of thefirst display region, the second display region, and the mounting regionare different from each other.

In an embodiment, in the first display region, a width of the pixeldriving circuit in a first direction is less than a width of the lightemitting device in the first direction.

In an embodiment, in the first display region, a difference between awidth of the pixel driving circuit in the first direction and a width ofany one of the plurality of light emitting devices in the firstdirection is about 3 μm to about 5 μm.

The present disclosure further provides a display device, including thedisplay substrate as described above.

In an embodiment, the display device further includes: a photosensitivesensor, and an orthographic projection of the photosensitive sensor onthe substrate is in the mounting region.

In an embodiment, the mounting region is rectangular, and an area of theorthographic projection of the photosensitive sensor on the substrate isequal to or smaller than an area of an inscribed circle of the seconddisplay region.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic distribution diagram of regions of a displaysubstrate.

FIG. 2 is a schematic diagram of a pixel driving circuit.

FIG. 3 is a layout of a pixel driving circuit according to an embodimentof the present disclosure.

FIG. 4 is a schematic distribution diagram of light emitting devices ina display substrate according to an embodiment of the presentdisclosure.

FIG. 5 is another schematic distribution diagram of light emittingdevices in the display substrate according to an embodiment of thepresent disclosure.

FIG. 6 is a schematic diagram illustrating an arrangement of pixeldriving circuits in a first display region and a second display regionaccording to an embodiment of the present disclosure.

FIGS. 7-10 are schematic diagrams of a first data line according toembodiments of the present disclosure.

FIG. 11 is a schematic diagram of a second data line according to anembodiment of the present disclosure.

FIG. 12 is a schematic diagram of connection between light emittingdevices in a mounting region and pixel driving circuits of a displaysubstrate according to an embodiment of the present disclosure.

FIG. 13 is another schematic diagram of connection between lightemitting devices in a mounting region and pixel driving circuits of adisplay substrate according to an embodiment of the present disclosure.

FIG. 14 is a schematic diagram of an active semiconductor layer of adisplay substrate according to an embodiment of the present disclosure.

FIG. 15 is a schematic diagram of a first conductive layer of a displaysubstrate according to an embodiment of the present disclosure.

FIG. 16 is a schematic diagram of a second conductive layer of a displaysubstrate according to an embodiment of the present disclosure.

FIG. 17 is a schematic diagram of a third conductive layer of a displaysubstrate according to an embodiment of the present disclosure.

FIG. 18 is a schematic diagram of a fourth conductive layer of a displaysubstrate according to an embodiment of the present disclosure.

FIG. 19 is a schematic diagram of first electrodes of light emittingdevices of a display substrate according to an embodiment of the presentdisclosure.

DETAILED DESCRIPTION

In order to make those skilled in the art better understand thetechnical solutions of the present disclosure, the present disclosure isfurther described in detail below with reference to the accompanyingdrawings and the detailed description.

Unless defined otherwise, technical or scientific terms used in thepresent disclosure shall have the ordinary meaning as understood by oneof ordinary skill in the art to which the present disclosure belongs.The terms “first,” “second,” and the like as used in the presentdisclosure are not intended to indicate any order, quantity, orimportance, but rather to distinguish one element from another. Also,the term “a,” “an,” or “the” and similar term do not denote a limitationof quantity, but rather denote the presence of at least one. The term“include” or “comprise”, or the like, mean that the element or itempreceding the term includes the element or item listed after the termand its equivalent, but do not exclude other elements or items. The term“connected”, “coupled” or the like are not restricted to physical ormechanical connections, but may include electrical connections, whetherdirect or indirect. The terms “upper”, “lower”, “left”, “right”, or thelike are used only to indicate relative positional relationships, andwhen the absolute position of the object being described is changed, therelative positional relationships may also be changed accordingly.

With the development of display technology, the design of a screen witha notch at the top is gradually unable to satisfy the demand of the userfor the high screen-to-body ratio of the display panel, and a series ofdisplay panels that can realize display in the mounting region emerge atthe right moment. In this kind of display panels, the hardware such as aphotosensitive sensor (for example, a camera) can be set up in themounting region. Because there is no need to punch holes, a true fullscreen is possible under the premise of ensuring the practicability ofthe display panel.

An embodiment of the disclosure provides a display substrate, and adisplay panel applied with the display substrate does not reduce thenumber of pixels in a display region and ensures a better display effectof the display region on the premise of ensuring reliable driving oflight emitting devices D in the mounting region and better lighttransmittance of the mounting region.

FIG. 1 is a schematic distribution diagram of regions of a displaysubstrate. As shown in FIG. 1 , the display substrate has a mountingregion Q3, a first display region Q1 surrounding the mounting region Q3,a transition region Q4 surrounding the first display region Q1, and asecond display region Q2 surrounding the transition region Q4. In anembodiment, the light emitting devices D are disposed in the mountingregion Q3, the transition region Q4, the first display region Q1, andthe second display region Q2 of the display substrate, and not only thelight emitting devices D but also pixel driving circuits 10 forsupplying driving signals to the light emitting devices D are disposedin the first display region Q1 and the second display region Q2. Sincethe mounting region Q3 needs to be provided with a photosensitive sensorwhile performing display, the light emitting devices D having a certaintransmittance are selected as the light emitting devices D in themounting region Q3. For example, the mounting region Q3 is not providedwith the pixel driving circuits 10, and the pixel driving circuits 10 ofthe light emitting devices D in the mounting region Q3 may be disposedin the first display region Q1 and/or the second display region Q2(hereinafter, the expression “the pixel driving circuit(s) of the lightemitting device(s)” means that the pixel driving circuit(s) for drivingthe light emitting device(s)). In order to facilitate electricalconnection between the light emitting devices D in the mounting regionQ3 and the pixel driving circuits 10 thereof, the pixel driving circuits10 of the light emitting devices D in the mounting region Q3 aredisposed in the first display region Q1 in some embodiments. In someembodiments, since the pixel driving circuits 10 of the light emittingdevices D in the mounting region Q3 are disposed in the first displayregion Q1, in order to facilitate the wiring of the signal lines (e.g.,data lines Vd) to which these pixel driving circuits 10 are coupled,only the light emitting devices D may be disposed in the transitionregion Q4 without the pixel driving circuits 10, and the pixel drivingcircuits 10 of the light emitting devices D in the transition region Q4may be disposed in the first display region Q1 and/or the second displayregion Q2. In order to facilitate electrical connection between thelight emitting devices D in the transition region Q4 and the pixeldriving circuits 10 thereof, the pixel driving circuits 10 of the lightemitting devices D in the transition region Q4 are also disposed in thefirst display region Q1 in some embodiments.

It should be noted that, in practice, the first display region Q1 is notlimited to be disposed around the mounting region, and if the mountingregion Q3 is at a corner, the first display region Q1 is adjacent toonly a part of the sides of the mounting region Q3. For example, thefirst display region Q1 surrounds two or three sides of the mountingregion Q3. In an embodiment of the present disclosure, the explanationis given by taking a case where the first display region Q1 surroundsthe mounting region Q3, the transition region Q4 surrounds the firstdisplay region Q1, and the second display region Q2 surrounds thetransition region as an example. Of course, the mounting region may beadjacent to the first display region Q1, and the transition region Q4may be located between the first display region Q1 and the seconddisplay region Q2.

FIG. 2 is a schematic diagram of a pixel driving circuit 10. As shown inFIG. 2 , the pixel driving circuit 10 may include: a reset sub-circuit1, a threshold compensation sub-circuit 2, a data writing sub-circuit 4,a driving sub-circuit 3, a first light emission control sub-circuit 5, asecond light emission control sub-circuit 6, and a storage sub-circuit7.

Referring to FIG. 2 , the first light emission control sub-circuit 5 iscoupled to a first voltage terminal VDD and a first terminal of thedriving sub-circuit 3, respectively, and is configured toconnect/disconnect the driving sub-circuit to/from the first voltageterminal VDD. The second light emission control sub-circuit 6 iselectrically coupled to a second terminal of the driving sub-circuit anda first electrode D1 of the light emitting device D, respectively, andis configured to connect/disconnect the driving sub-circuit 3 to/fromthe light emitting device D. The data writing sub-circuit 4 iselectrically coupled to the first terminal of the driving sub-circuit 3and is configured to write a data signal into the storage sub-circuit 7under the control of a scan signal. The storage sub-circuit 7 iselectrically coupled to a control terminal of the driving sub-circuit 3and the first voltage terminal VDD, respectively, and is configured tostore the data signal. The threshold compensation sub-circuit 2 iselectrically coupled to the control terminal and the second terminal ofthe driving sub-circuit 3, respectively, and is configured to performthreshold compensation on the driving sub-circuit 3. The resetsub-circuit 1 is electrically coupled to the control terminal of thedriving sub-circuit 3 and the first electrode D1 of the light emittingdevice D, and is configured to reset the control terminal of the drivingsub-circuit 3 and the first electrode D1 of the light emitting device Dunder the control of a reset control signal.

FIG. 3 is a layout of the pixel driving circuit 10 according to anembodiment of the present disclosure. Referring to FIGS. 2 and 3 , thedriving sub-circuit 3 includes a driving transistor T3, the controlterminal of the driving sub-circuit 3 includes a control electrode ofthe driving transistor T3, the first terminal of the driving sub-circuit3 includes a first electrode of the driving transistor T3, and thesecond terminal of the driving sub-circuit 3 includes a second electrodeof the driving transistor T3. The data writing sub-circuit 4 includes adata writing transistor T4, the storage sub-circuit 7 includes a storagecapacitor Cst, the threshold compensation sub-circuit 2 includes athreshold compensation transistor T2, the first light emission controlsub-circuit 5 includes a first light emission control transistor T5, thesecond light emission control sub-circuit 6 includes a second lightemission control transistor T6, and the reset sub-circuit 1 includes afirst reset transistor T1 and a second reset transistor T7, and thereset control signal includes a first sub-reset control signal and asecond sub-reset control signal.

It should be noted that, according to the characteristics of thetransistors, the transistors may be classified into N-type transistorsand P-type transistors. For the sake of clarity, the embodiments of thepresent disclosure use the transistors as P-type transistors (forexample, P-type MOS transistors) to illustrate the technical solutionsof the present disclosure in detail. That is, in the description of thepresent disclosure, the driving transistor T3, the data writingtransistor T4, the threshold compensation transistor T2, the first lightemission control transistor T5, the second light emission controltransistor T6, the first reset transistor T1, the second resettransistor T7, and the like may all be P-type transistors. However, thetransistors of the embodiments of the present disclosure are not limitedto P-type transistors, and one skilled in the art may also implement thefunctions of one or more transistors of the embodiments of the presentdisclosure by using N-type transistors (e.g., N-type MOS transistors) ora combination of P-type transistors and N-type transistors according toactual needs.

In addition, the transistors used in the embodiments of the presentdisclosure may be thin film transistors, field effect transistors orother switching devices having the same characteristics, and the thinfilm transistors may include oxide semiconductor thin film transistors,amorphous silicon thin film transistors, polysilicon thin filmtransistors, and the like. Each transistor includes a first electrode, asecond electrode and a control electrode. The control electrode servesas a gate electrode of the transistor, one of the first electrode andthe second electrode serves as a source electrode of the transistor, andthe other serves as a drain electrode of the transistor. The source anddrain electrodes of the transistor may be symmetrical in structure, sothat there may be no difference between the source electrode and thedrain electrode in physical structure. In an embodiments of the presentdisclosure, in order to distinguish transistors, except for the gateelectrode serving as the control electrode, the first electrode isdirectly described as the source electrode, and the second electrode isdirectly described as the drain electrode, so that the source and thedrain electrodes of all or some of the transistors in the embodiments ofthe present disclosure may be interchanged as necessary.

Continuing to refer to FIG. 2 , the source electrode of the data writingtransistor T4 is electrically coupled to the source electrode of thedriving transistor T3, the drain electrode of the data writingtransistor T4 is configured to be electrically coupled to the data lineVd to receive the data signal, and the gate electrode of the datawriting transistor T4 is configured to be electrically coupled to afirst scan signal line Ga1 to receive the scan signal. A first plate CC1of the storage capacitor Cst is electrically coupled to the first powervoltage terminal VDD, and a second plate CC2 of the storage capacitorCst is electrically coupled to the gate electrode of the drivingtransistor T3. A source electrode of the threshold compensationtransistor T2 is electrically coupled to the drain electrode of thedriving transistor T3, a drain electrode of the threshold compensationtransistor T2 is electrically coupled to the gate electrode of thedriving transistor T3, and a gate electrode of the thresholdcompensation transistor T2 is configured to be electrically coupled to asecond scan signal line Ga2 to receive a compensation control signal. Asource electrode of the first reset transistor T1 is configured to beelectrically coupled to the first reset power terminal Vinit1 to receivea first reset signal, a drain electrode of the first reset transistor T1is electrically coupled to the gate electrode of the driving transistorT3, and a gate electrode of the first reset transistor T1 is configuredto be electrically coupled to a first reset control signal line Rst1 toreceive a first sub-reset control signal. A source electrode of thesecond reset transistor T7 is configured to be electrically coupled tothe first reset power terminal Vinit1 to receive the first reset signal,a drain electrode of the second reset transistor T7 is electricallycoupled to the first electrode D1 of the light emitting device D, and agate electrode of the second reset transistor T7 is configured to beelectrically coupled to the second reset control signal line Rst2 toreceive a second sub-reset control signal. A source electrode of thefirst light emission control transistor T5 is electrically coupled tothe first power voltage terminal VDD, a drain electrode of the firstlight emission control transistor T5 is electrically coupled to thesource electrode of the driving transistor T3, and a gate electrode ofthe first light emission control transistor T5 is configured to beelectrically coupled to a first light emission control signal line EM1to receive a first light emission control signal. A source electrode ofthe second light emission control transistor T6 is electrically coupledto the drain electrode of the driving transistor T3, a drain electrodeof the second light emission control transistor T6 is electricallycoupled to the first electrode D1 of the light emitting device D, and agate electrode of the second light emission control transistor T6 isconfigured to be electrically coupled to a second light emission controlsignal line EM2 to receive a second light emission control signal. Asecond electrode D3 of the light emitting device D is electricallycoupled to a second power voltage terminal VSS.

For example, one of the first power voltage terminal VDD and the secondpower voltage terminal VSS is a terminal providing a high voltage, andthe other is a terminal providing a low voltage. For example, in anembodiment as shown in FIG. 2 , the first power voltage terminal VDD isa voltage source to output a constant first voltage, which is a positivevoltage; and the second power voltage terminal VSS may be a voltagesource to output a constant second voltage, which is a negative voltage.For example, in some examples, the second power voltage terminal VSS maybe grounded.

With continued reference to FIG. 2 , the scan signal and thecompensation control signal may be the same, i.e., the gate electrode ofthe data writing transistor T4 and the gate electrode of the thresholdcompensation transistor T2 may be electrically coupled to the samesignal line, e.g., the first scan signal line Ga1, to receive the samesignal (e.g., the scan signal). In this case, the display substrate maynot be provided with the second scan signal line Ga2, thereby reducingthe number of signal lines. For another example, the gate electrode ofthe data writing transistor T4 and the gate electrode of the thresholdcompensation transistor T2 may be electrically coupled to differentsignal lines, i.e., the gate electrode of the data writing transistor T4is electrically coupled to the first scan signal line Ga1, the gateelectrode of the threshold compensation transistor T2 is electricallycoupled to the second scan signal line Ga2, and the signals transmittedby the first scan signal line Ga1 and the second scan signal line Ga2are the same.

It should be noted that the scan signal and the compensation controlsignal may not be the same, so that the gate electrode of the datawriting transistor T4 and the gate electrode of the thresholdcompensation transistor T2 may be separately controlled, therebyincreasing the flexibility of controlling the pixel driving circuit 10.In an embodiment of the present disclosure, the explanation is given bytaking a case where the gate electrode of the data writing transistor T4and the gate electrode of the threshold compensation transistor T2 areelectrically coupled to the first scan signal line Ga1 as an example.

Continuing to refer to FIG. 2 , the first and second light emissioncontrol signals may be the same, i.e., the gate electrode of the firstlight emission control transistor T5 and the gate electrode of thesecond light emission control transistor T6 may be electrically coupledto the same signal line (e.g., the first light emission control signalline EM1) to receive the same signal (e.g., the first light emissioncontrol signal). In this case, the display substrate may not be providedwith the second light emission control signal line EM2, thereby reducingthe number of signal lines. For another example, the gate electrode ofthe first light emission control transistor T5 and the gate electrode ofthe second light emission control transistor T6 may be electricallycoupled to different signal lines, respectively, that is, the gateelectrode of the first light emission control transistor T5 iselectrically coupled to the first light emission control signal lineEM1, the gate electrode of the second light emission control transistorT6 is electrically coupled to the second light emission control signalline EM2, and the signals transmitted by the first light emissioncontrol signal line EM1 and the second light emission control signalline EM2 are the same.

It should be noted that, in a case where the first light emissioncontrol transistor T5 and the second light emission control transistorT6 are different types of transistors (for example, the first lightemission control transistor T5 is a P-type transistor, and the secondlight emission control transistor T6 is an N-type transistor), the firstlight emission control signal and the second light emission controlsignal may also be different, and the embodiments of the disclosure arenot limited thereto. In an embodiment of the present disclosure, theexplanation is given by taking a case where the first light emissioncontrol line is coupled to the gate electrodes of the first lightemission control transistor T5 and the second light emission controltransistor T6 as an example.

For example, the first and second sub-reset control signals may be thesame, that is, the gate electrode of the first reset transistor T1 andthe gate electrode of the second reset transistor T7 may be electricallycoupled to the same signal line (for example, the first reset controlsignal line Rst1) to receive the same signal (for example, the firstsub-reset control signal). In this case, the display substrate may notbe provided with the second reset control signal line Rst2, therebyreducing the number of signal lines. For another example, the gateelectrode of the first reset transistor T1 and the gate electrode of thesecond reset transistor T7 may be electrically coupled to differentsignal lines, respectively, that is, the gate electrode of the firstreset transistor T1 is electrically coupled to the first reset controlsignal line Rst1, the gate electrode of the second reset transistor T7is electrically coupled to the second reset control signal line Rst2,and the signals transmitted by the first reset control signal line Rst1and the second reset control signal line Rst2 are the same. It should benoted that the first sub-reset control signal and the second sub-resetcontrol signal may be also different.

For example, in some examples, the second sub-reset control signal maybe the same as the scan signal, i.e., the gate electrode of the secondreset transistor T7 may be electrically coupled to the scan signal lineGa to receive the scan signal as the second sub-reset control signal.

For example, the source electrode of the first reset transistor T1 andthe source electrode of the second reset transistor T7 are coupled tothe first reset power terminal Vinit1 and the second reset powerterminal Vinit2, respectively, and the first reset power terminal Vinit1and the second reset power terminal Vinit2 may be DC reference voltageterminals to output constant DC reference voltages. The first resetpower terminal Vinit1 and the second reset power terminal Vinit2 may bethe same, for example, the source electrode of the first resettransistor T1 and the source electrode of the second reset transistor T7are coupled to the same reset power terminal. The first and second resetpower terminals Vinit1 and Vinit2 may be terminals providing highvoltages or terminals providing low voltages, as long as they canprovide first reset signals to reset the gate electrode of the drivingtransistor T3 and the first electrode D1 of the light emitting device,and the present disclosure is not limited thereto. For example, thesource electrode of the first reset transistor T1 and the sourceelectrode of the second reset transistor T7 may both be coupled to thereset power signal line Init.

Continuing to refer to FIG. 3 , for each pixel driving circuit 10, in afirst direction, the first transistor and the seventh transistor arearranged substantially side by side, the second transistor, the thirdtransistor, the fourth transistor are arranged substantially side byside, and the fifth transistor and the sixth transistor are arrangedsubstantially side by side. In a second direction, the secondtransistor, the sixth transistor, and the seventh transistor arearranged substantially side by side, the first transistor and the thirdtransistor are arranged substantially side by side, and the fourthtransistor and the fifth transistor are arranged substantially side byside. In an embodiment, the first direction may include but is notlimited to a row direction X, the second direction includes but is notlimited to a column direction Y, and the first and second directionsinclude but are not limited to directions that are perpendicular orsubstantially perpendicular. In an embodiment of the present disclosure,the explanation is given by taking a case where the first direction isthe row direction X, and the second direction is the column direction Yas an example. It should be noted that the reset sub-circuit 1, thethreshold compensation sub-circuit 2, the data writing sub-circuit 4,the driving sub-circuit 3, the first light emission control sub-circuit5, the second light emission control sub-circuit 6, and the storagesub-circuit 7 in the pixel driving circuit 10 shown in FIG. 2 are onlyillustrative, and the specific structures of the sub-circuits such asthe reset sub-circuit 1, the threshold compensation sub-circuit 2, thedata writing sub-circuit 4, the driving sub-circuit 3, the first lightemission control sub-circuit 5, the second light emission controlsub-circuit 6, and the storage sub-circuit 7 may be set according topractical application requirements, which is not limited in theembodiment of the present disclosure.

Each of the pixel driving circuits 10 may include an activesemiconductor layer, a first gate insulating layer, a first conductivelayer, a second gate insulating layer, a second conductive layer, aninterlayer insulating layer, a third conductive layer, and a firstplanarization layer and/or a passivation layer sequentially disposed ona substrate. The light emitting device includes a first electrode, asecond electrode, and a light emitting layer between the first electrodeand the second electrode, one of the first electrode and the secondelectrode is an anode, and the other is a cathode. In embodiments of thepresent disclosure, the explanation is given by taking a case where thefirst electrode is an anode, and the second electrode is a cathode as anexample. The anode of the light emitting device may be located at a sideof the first planarization layer and/or the passivation layer away fromthe substrate. The active layers of the transistors are located in theactive semiconductor layer, and the active semiconductor layer mayinclude a pattern of a doped region that may serve as a source/drainelectrode of each transistor. In an embodiment, the gate electrode ofeach transistor, one electrode of the storage capacitor (e.g., thesecond plate of the storage capacitor Cst), the gate line, the first andsecond light emission control signal lines EM1 and EM2, and the firstand second sub-reset control signal lines Rst1 and Rst may be located inthe first conductive layer. In an embodiment, the other electrode of thestorage capacitor (e.g., the first plate of the storage capacitor Cst)and the first reset power line Init1 and the second reset power lineInit2 may be located in the second conductive layer. In an embodiment,the data line Vd, the first power voltage terminal VDD, and the like maybe located in the third conductive layer. The first gate insulatinglayer, the second gate insulating layer, and the interlayer insulatinglayer have via holes formed therein for connection of the pattern in theabove respective conductive layers and the pattern in the activesemiconductor layer. In an embodiment, the first planarization layerand/or the passivation layer has a via hole formed therein forconnection with the anode of the light emitting device. In some otherembodiments, the display substrate may further include a fourthconductive layer, and a second planarization layer located on a side ofthe fourth conductive layer away from the substrate, and the anode isformed on a side of the second planarization layer away from thesubstrate. The fourth conductive layer is coupled to the thirdconductive layer through a via hole formed in the first planarizationlayer/passivation layer, and the second planarization layer is formedwith a via hole therein for connecting the anode to the fourthconductive layer.

It should be noted that, in an embodiment of the present disclosure, thepixel driving circuit 10 of the sub-pixel may also be a structureincluding other number of transistors other than the 7T1C (i.e.,seven-transistors-and-one-capacitor) structure shown in FIGS. 2 and 3 ,for example, a 7T2C structure, a 6T1C structure, a 6T2C structure, or a9T2C structure, which is not limited in the embodiment of the presentdisclosure.

FIG. 4 is a schematic distribution diagram of light emitting devices ina display substrate according to an embodiment of the presentdisclosure. As shown in FIG. 4 , the display substrate includes aplurality of light emitting units 100, and each light emitting unitincludes light emitting devices D of three colors, i.e., a first colorlight emitting device, a second color light emitting device, and a thirdcolor light emitting device. In an embodiment of the present disclosure,the description will be given by taking a case where the first colorlight emitting device is a red light emitting device R, the second colorlight emitting device is a green light emitting device G, and the thirdcolor light emitting device is a blue light emitting device B as anexample. But the present disclosure is not limited thereto, and thecolors may be interchanged.

Continuing to refer to FIG. 4 , taking the case where the first colorlight emitting device is the red light emitting device R, the secondcolor light emitting device is the green light emitting device G, andthe third color light emitting device is the blue light emitting deviceB as an example, in each light emitting unit 100, the number of the redlight emitting device R is 2, and the number of the green light emittingdevice G and the number of the blue light emitting device B are 1,respectively. Alternatively, in each light emitting unit 100, the numberof green light emitting device G is 2, and the number of red lightemitting device R and the number of blue light emitting device G are 1,respectively. Alternatively, in each light emitting unit 100, the numberof the blue light emitting device B is 2, and the number of the red andgreen light emitting device R and G is 1. Of course, it should befurther noted that, in the embodiment of the present disclosure, thecolors of the light emitting devices D in each light emitting unit 100are not limited to three. For example, each pixel unit includes fourcolor light emitting devices D of a red light emitting device R, a greenlight emitting device G, a blue light emitting device B, and a whitelight emitting device W. In an embodiment of the present disclosure, theexplanation is given by taking a case where each light emitting unit 100includes two green light emitting devices G, one red light emittingdevice R and one blue light emitting device B as an example.

FIG. 5 is another schematic distribution diagram of light emittingdevices in the display substrate according to an embodiment of thedisclosure. As shown in FIG. 5 , the light emitting devices D in thedisplay substrate are illustrated as a plurality of light emittingdevice groups A20 arranged in the row direction X, and each lightemitting device group A20 includes a plurality of light emitting devicesD arranged in the column direction Y As shown in FIG. 5 , the lightemitting devices D in the odd-numbered columns are red light emittingdevices R and blue light emitting devices B alternately arranged, andthe light emitting devices D in the even-numbered columns are greenlight emitting devices G. Of course, the light emitting devices D in theodd-numbered columns may be interchanged with the light emitting devicesD in the even-numbered columns.

In addition, the four light emitting devices D of each light emittingunit 100 in the first and second display regions Q1 and Q2 arerespectively driven by the four pixel driving circuits adjacentlydisposed in the same row. The pixel driving circuits 10, of the lightemitting devices D located in the same region and in the same column,are also located in the same column. For example, the pixel drivingcircuits 10, of the light emitting devices D located in the mountingregion Q3 and in the same column, are also in the same column in thefirst display region Q1.

An embodiment of the present disclosure provides a display substratehaving substantially the same structure as the display substratedescribed above, and having a mounting region Q3, a first display regionQ1, and a second display region Q2. The display substrate in theembodiment of the present disclosure includes a substrate, a pluralityof pixel driving circuits 10 and a plurality of light emitting devices Ddisposed on the substrate. In an embodiment, the plurality of pixeldriving circuits 10 are disposed only in the first display region Q1 andthe second display region Q2, the plurality of light emitting devices Dinclude a plurality of light emitting device groups A20 arranged in therow direction X, and the light emitting devices D in each of the lightemitting device groups A20 are arranged in the column direction Y In anembodiment of the present disclosure, the resolutions of the displaysubstrate in the first display region Q1, the second display region Q2,and the mounting region Q3 are the same, that is, the numbers of thelight emitting devices D in the first display region Q1, the seconddisplay region Q2, and the mounting region Q3 per unit area are thesame. In some embodiments, ratios of respective light emission areas ofat least two of the first display region Q1, the second display regionQ2, and the mounting region Q3 to respective total areas of the at leasttwo of the first display region Q1, the second display region Q2, andthe mounting region Q3 are different from each other. For example, thepixel driving circuits 10 of the light emitting devices D in themounting region Q3 are disposed in the first display region Q1, that is,in the embodiment of the present disclosure, the arrangement density ofthe pixel driving circuits 10 in the first display region Q1 is greaterthan the arrangement density of the pixel driving circuits 10 in thesecond display region Q2.

It should be noted that the arrangement density of the pixel drivingcircuits 10 is measured by the number of pixel driving circuits 10provided in a unit area.

In some embodiments of the present disclosure, a ratio of the area ofthe pattern of the active semiconductor layer in the first displayregion Q1 to the area of the first display region Q1 is greater than aratio of the area of the pattern of the active semiconductor layer inthe second display region Q2 to the area of the second display regionQ2.

In some embodiments of the present disclosure, a ratio of the area ofthe pattern of at least one of the first conductive layer, the secondconductive layer, the third conductive layer, and the fourth conductivelayer in the first display region Q1 to the area of the first displayregion Q1 is greater than a ratio of the area of the pattern of therespective one(s) of the first conductive layer, the second conductivelayer, the third conductive layer, and the fourth conductive layer inthe second display region Q2 to the area of the second display regionQ2. That is, the ratio of the area of the pattern of the firstconductive layer in the first display region Q1 to the area of the firstdisplay region Q1 is greater than the ratio of the area of thecorresponding pattern of the first conductive layer in the seconddisplay region Q2 to the area of the second display region Q2, and/or,the ratio of the area of the pattern of the second conductive layer inthe first display region Q1 to the area of the first display region Q1is greater than the ratio of the area of the corresponding pattern ofthe second conductive layer in the second display region Q2 to the areaof the second display region Q2, and/or, the ratio of the area of thepattern of the third conductive layer in the first display region Q1 tothe area of the first display region Q1 is greater than the ratio of thearea of the corresponding pattern of the third conductive layer in thesecond display region Q2 to the area of the second display region Q2,and/or, the ratio of the area of the pattern of the fourth conductivelayer in the first display region Q1 to the area of the first displayregion Q1 is greater than the ratio of the area of the correspondingpattern of the fourth conductive layer in the second display region Q2to the area of the second display region Q2.

In an embodiment of the present disclosure, the manner of achieving thearrangement density of the pixel driving circuits 10 in the firstdisplay region Q1 greater than the arrangement density of the pixeldriving circuits 10 in the second display region Q2 includes, but is notlimited to, reducing the distances, in the row direction X and/or thecolumn direction Y, between at least some transistors in at least somepixel driving circuits 10 in the first display region Q1 to reduce thewidth of the pixel driving circuit 10. For example, FIG. 6 is aschematic diagram of a compressed pixel driving circuit 10 according toan embodiment of the disclosure. Referring to FIG. 6 , the distancebetween the transistors arranged side by side in the row direction X maybe compressed. Specifically, at least one of the distance between thefirst transistor and the seventh transistor, the distance between thesecond transistor, the third transistor, the fourth transistor, and thedistance between the fifth transistor and the sixth transistor may becompressed. For example, the distance between the transistors arrangedside by side in the column direction Y may be compressed. Specifically,at least one of the distance between the seventh transistor T7, thesecond transistor T2, and the sixth transistor T6, the distance betweenthe first transistor T1 and the third transistor T3, and the distancebetween the fourth transistor T4 and the fifth transistor T5 may becompressed. For example, the distance between transistors disposed inthe row direction X and the distance between transistors disposed in thecolumn direction Y may also be compressed at the same time. In anembodiment of the present disclosure, it is also possible to achieve agreater arrangement density of the pixel driving circuits 10 in thefirst display region Q1 than the arrangement density of the pixeldriving circuits 10 in the second display region Q2 by compressing thewidth of the data line Vd in the row direction X configured to supplythe data signal to the pixel driving circuits 10 of the light emittingdevices D in the mounting region Q3. In an embodiment of the presentdisclosure, it is also possible to achieve a greater arrangement densityof the pixel driving circuits 10 in the first display region Q1 than thearrangement density of the pixel driving circuits 10 in the seconddisplay region Q2 by compressing the width of other signal lines orpatterns in the conductive layer. FIG. 6 is a schematic layout of pixeldriving circuits in the first display region and the second displayregion according to an embodiment of the present disclosure. As shown inFIG. 6 , the area of the pixel driving circuit 10 in the second displayregion Q2 is significantly larger than the area of the pixel drivingcircuit 10 in the first display region Q1 per unit area 20.

In some embodiments, the display substrate further includes a pluralityof data lines Vd, and at least some data lines Vd include portionslocated at different layers. For example, one data line Vd may include aportion disposed in the same layer as the gate electrode of thetransistor, a portion disposed in the same layer as the source and drainelectrodes of the transistor, a portion disposed in the same layer asthe first electrode D1 of the light emitting device D, and the like. Inan embodiment of the present disclosure, the data line Vd including theportions in different layers includes, but is not limited to, the dataline Vd supplying the data signal to the pixel driving circuit 10 of thelight emitting device D in the mounting region Q3.

In some embodiments, a portion of the data lines Vd in the displaysubstrate is arranged in a bend line in the display region. For example,one data line Vd includes a portion extending in the row direction X, aportion extending in the column direction Y, and a portion extending ina direction having an angle with the row direction X and/or the columndirection Y. In some embodiments, the data line Vd includes a portionlocated in the first display region Q1 and a portion located in thesecond display region Q2, and the two portions are not on the samestraight line, so that the data line Vd is arranged as a bend line. Forexample, the portion of the data line Vd in the first display region Q1is a straight line, and the portion of the data line Vd in the seconddisplay region Q2 is a bend line. In some embodiments, the portionlocated in the first display region Q1 and the portion located in thesecond display region Q2 are both straight lines and are not parallel toeach other, so that the data line Vd is arranged as a bend line. Forexample, the portion of the data line Vd located in the first displayregion Q1 extends in the column direction Y, and the extending directionof the portion of the data line Vd located in the second display regionQ2 has an angle with the row direction X; or the extending direction ofthe portion of the data line Vd located in the first display region Q1has an angle with the row direction X, and the portion of the data lineVd located in the second display region Q2 extends in the columndirection Y.

In some embodiments, FIG. 7 is a schematic diagram of a first data lineaccording to an embodiment of the present disclosure. As shown in FIG. 7, at least one data line Vd among the data lines Vd arranged as a bendline is a first data line Vd-1, the first data line Vd-1 includes afirst sub data line segment Vd-11 coupled to the pixel driving circuit10 for driving the light emitting device D in the mounting region Q3,and a second sub data line segment Vd-12 coupled to the pixel drivingcircuit 10 for driving the light emitting device D in the second displayregion Q2, and the first sub data line segment Vd-11 and the second subdata line segment Vd-12 are not on the same straight line. The one dataline Vd refers to a data line Vd coupled to the same end of the datadriving IC and transmitting the same signal, and may include portionslocated on different conductive layers.

In some embodiments, the first and second sub data line segments Vd-11,Vd-12 include portions that are substantially parallel. For example, thefirst sub data line segment Vd-11 and the second sub data line segmentVd-12 both extend in the column direction Y.

In some embodiments, continuing to refer to FIG. 7 , the first data lineVd-1 may further include a third sub data line segment Vd-13 for drivingthe light emitting devices D in the first display region Q1, the firstsub data line segment Vd-11 and the third sub data line segment Vd-13not being on the same straight line. For example, the first sub dataline segment Vd-11 extends along the column direction Y, and the thirdsub data line segment Vd-13 has a certain angle with the columndirection Y or the third sub data line segment Vd-13 is a bend line.

In some embodiments, the first sub data line segment includes adifferent material from the second sub data line segment, and/or thefirst sub data line segment includes a different material from the thirdsub data line segment. In some embodiments, continuing to refer to FIGS.7-9 , the first data line Vd-1 includes not only the first sub data linesegment Vd-11, the second sub data line segment Vd-12, and the third subdata line segment Vd-13, but also a first transfer electrode Vd-14 and asecond transfer electrode Vd-15. For example, the second sub data linesegment Vd-12 includes a first part and a second part which arerespectively arranged on two opposite sides of the mounting region inthe column direction Y; one end of the first sub data line segment Vd-11is electrically coupled to the first part of the second sub data linesegment Vd-12 through the first transfer electrode Vd-14, and the otherend of the first sub data line segment Vd-11 is electrically coupled tothe second part of the second sub data line segment Vd-12 through thesecond transfer electrode Vd-15.

In one example, at least some first transfer electrodes Vd-14 and atleast some second transfer electrodes Vd-15 have substantially the samelength in the row direction X, e.g., each of the first and secondtransfer electrodes Vd-14 and Vd-15 has the same length in the rowdirection X. In this case, it is ensured that the coupling linecapacitances are the same between the first transfer electrodes Vd-14and between the second transfer electrodes Vd-15. In some embodiments,the first and second transfer electrodes Vd-14 and Vd-15 include, butare not limited to, being disposed in the same layer and the samematerial as the first plate of the storage capacitor. For example, thefirst and second transfer electrodes Vd-14 and Vd-15 are disposed in thesecond conductive layer. The first sub data line segment Vd-11, thesecond sub data line segment Vd-12 and the third sub data line segmentVd-13 of the first data line Vd-1 include metal, such as Ti, Al and thelike. The first sub data line segment Vd-11, the second sub data linesegment Vd-12 and the third sub data line segment Vd-13 of the firstdata line Vd-1 are arranged in the third conductive layer.

In some embodiments, FIG. 10 is a schematic diagram of a second dataline according to an embodiment of the present disclosure. As shown inFIG. 10 , some data lines Vd arranged in a bend line include a seconddata line Vd-2, and the second data line Vd-2 includes a fourth sub dataline segment Vd-16 coupled to the pixel driving circuits 10 for drivingthe light emitting devices D in the second display region Q2 and a fifthsub data line segment Vd-17 coupled to the pixel driving circuits 10 fordriving the light emitting devices D in the first display region Q1.

In some embodiments, the fourth and fifth sub data line segments Vd-16and Vd-17 are not on the same straight line. For example, the fourth subdata line segment Vd-16 includes two portions located at opposite sidesof the second display region Q2 in the column direction, the twoportions extending in the column direction Y, and the fifth sub dataline segment Vd-17 is a bend line.

In some embodiments, in the first display region Q1, the distancebetween nodes at which two pixel driving circuits 10 adjacent in the rowdirection X are respectively coupled to corresponding data lines Vd isd1; in the second display region Q2, the distance between nodes at whichtwo pixel driving circuits 10 adjacent in the row direction X arerespectively coupled to corresponding data lines Vd is d2; and d1 isless than d2. That is, the distance of two data lines Vd adjacentlydisposed in the row direction X in the first display region Q1 issmaller than the distance of the two data lines Vd adjacently disposedin the row direction X in the second display region Q2. The node atwhich the pixel driving circuit 10 is coupled to the data line Vd is,for example, a via hole for connecting the data line to the data writingtransistor.

It should be noted that, in an embodiment of the present disclosure, thedata lines Vd, the first data lines Vd-1, and the second data lines Vd-2may be directly coupled to the pixel driving circuits 10, and the term“directly coupled” includes a manner of being coupled through via holespenetrating through the insulating layer. Of course, the data lines Vd,the first data lines Vd-1, and the second data lines Vd-2 may be coupledto the pixel driving circuits 10 by means of transfer electrodes and thelike.

In some embodiments, the pixel driving circuits 10 of the light emittingdevices D in the same column are electrically coupled to the same dataline Vd, and the pixel driving circuits 10 in the same row areelectrically coupled to the same gate line, so that the layout of thesignal lines on the display substrate can be easy, and the control ofthe pixel driving circuits 10 can be facilitated.

In some embodiments, FIG. 11 is a schematic diagram of a mounting regionQ3 and a first display region Q1 of a display substrate according to anembodiment of the present disclosure. As shown in FIG. 11 , the mountingregion Q3 may include, but is not limited to, a rectangle shape, acircle shape, an oval shape, and a drop shape, and the mounting regionQ3 is exemplified as a rectangle in an embodiment of the presentdisclosure. The portion of the first display region Q1 around themounting region Q3 is divided into a first sub display region Q11 and asecond sub display region Q12 oppositely disposed in the row directionX, and a third sub display region Q13 and a fourth sub display regionQ14 oppositely disposed in the column direction Y. The plurality ofpixel driving circuits 10 in the display substrate of the embodiment ofthe present disclosure may be divided into a plurality of first pixeldriving circuit groups disposed along the row direction X and located inthe first display region Q1, and a plurality of second pixel drivingcircuit groups located in the second display region Q2. The pixeldriving circuits 10 in each of the first pixel driving circuit group andthe second pixel driving circuit group are arranged in the columndirection Y. For example, the number of the light emitting device groupsA20 in the mounting region Q3 is M, and in this case, the pixel drivingcircuits 10 in the M first pixel driving circuit groups supply drivingsignals to the light emitting devices D in the mounting region Q3. Forconvenience of understanding, the first pixel driving circuit groupsupplying driving signals to the light emitting devices D in themounting region Q3 is referred to as a first sub-pixel driving circuitgroup A10, in an embodiment of the present disclosure.

FIG. 12 is a schematic diagram of connection between the light emittingdevices in the mounting region and the pixel driving circuits 10 of thedisplay substrate according to an embodiment of the disclosure. As shownin FIG. 12 , in one example, the pixel driving circuits 10 of therespective light emitting devices D belonging to the same light emittingdevice group A20 in the mounting region Q3 are located in the same firstsub-pixel driving circuit group A10. This kind of connection isconvenient for layout to avoid short circuit between signal lines.

FIG. 13 is another schematic diagram of connection between lightemitting devices in a mounting region and pixel driving circuits of adisplay substrate according to an embodiment of the present disclosure.As shown in FIG. 13 , in some embodiments, at least some first sub-pixeldriving circuit groups A10 have substantially the same distance from theedge of the mounting region Q3. For example, in some embodiments, Mfirst sub-pixel driving circuit groups A10 are disposed in the firstsub-display region Q11 and the second sub-display region Q12. Among theM light emitting device groups A20 in the mounting region Q3, the 1^(st)to the M-th light emitting device groups A20 are arranged one by one ina direction from the first sub-display region Q11 towards the secondsub-display region Q12. The first sub-display region Q11 and the secondsub-display region Q12 are provided with M/2 first sub-pixel drivingcircuit groups A10, and the 1^(st) to the (M/2)-th first sub-pixeldriving circuit groups A10 are located in the first sub-display regionQ11 and are sequentially arranged along a direction away from themounting region Q3; the (M/2+1)-th to the M-th first sub-pixel drivingcircuit groups A10 are located in the second sub-display region Q12 andare sequentially arranged along a direction close to the mounting regionQ3. The first electrodes D1 of the respective light emitting devices Din the i-th light emitting device group A20 in the mounting region Q3are coupled to the pixel driving circuits 10 in the i-th first sub-pixeldriving circuit group A10 in a one-to-one correspondence by signalconnection lines, i having a value from 1 to M. For example, the pixeldriving circuits 10 in the first sub-pixel driving circuit group A10,which is the first one (the one that is closest to the mounting regionQ3) of the first sub-pixel driving circuit groups A10, in the firstsub-display region Q11 are coupled in one-to-one correspondence to thefirst electrodes D1 of the light emitting devices D in the first lightemitting device group A20 in the mounting region Q3.

For example, in some embodiments, M first sub-pixel driving circuitgroups A10 are disposed in the first sub-display region Q11 and thesecond sub-display region Q12. Among the M light emitting device groupsA20 in the mounting region Q3, the 1^(st) to the M-th light emittingdevice groups A20 are arranged one by one in a direction from the firstsub-display region Q11 towards the second sub-display region Q12. Thefirst sub-display region Q11 and the second sub-display region Q12 areprovided with M/2 first sub-pixel driving circuit groups A10, and the1^(st) to the (M/2)-th first sub-pixel driving circuit groups A10 arelocated in the first sub-display region Q11 and are sequentiallyarranged along a direction close to the mounting region Q3; the(M/2+1)-th to the M-th first sub-pixel driving circuit groups A10 arelocated in the second sub-display region Q12 and are sequentiallyarranged along a direction close to the mounting region Q3. The firstelectrodes D1 of the respective light emitting devices D in the i-thlight emitting device group A20 in the mounting region Q3 are coupled tothe pixel driving circuits 10 in the i-th first sub-pixel drivingcircuit group A10 in a one-to-one correspondence by signal connectionlines, i having a value from 1 to M. For example, the pixel drivingcircuits 10 in the first sub-pixel driving circuit group A10, which isthe first one (the one that is closest to the mounting region Q3) of thefirst sub-pixel driving circuit groups A10, in the first sub-displayregion Q11 are coupled in one-to-one correspondence to the firstelectrodes D1 of the light emitting devices D in the (M/2)-th lightemitting device group A20 in the mounting region Q3.

It should be noted that, in the above connection manner, M is an evennumber, and when M is an odd number, the connection manner is asfollows. In this case, the ((M+1)/2)-th first sub-pixel driving circuitgroup A10 may be disposed in the first sub-display region Q11, or the((M+1)/2)-th first sub-pixel driving circuit group A10 may be disposedin the second sub-display region Q12, and the connection manner is thesame as that described above, and the description thereof is notdescribed here.

In some embodiments, the first sub-pixel driving circuit group A10 isdisposed in each of the first and second sub-display regions Q11 andQ12, and a ratio of the closest distance among the distance(s) from atleast one first sub-pixel driving circuit group A10 located in the firstsub-display region Q11 to an edge of the mounting region Q3, to theclosest distance among the distance(s) from at least one first sub-pixeldriving circuit group A10 located in the second sub-display region Q12to an edge of the mounting region Q3 is about 0.8 to 1.2. The outermostcolumn or the outmost row of light emitting devices D in the mountingregion Q3 is adjacent to a column or a row of light emitting devices Din the first display region closest to the mounting region Q3.Continuing to refer to FIG. 13 , in some embodiments, the respectivelight emitting devices D located in the mounting region Q3 areelectrically coupled to the pixel driving circuits 10 through signalconnection lines. The signal connection lines coupled to the pixeldriving circuits 10 in the 1^(st) and the M-th first sub-pixel drivingcircuit groups A10 are disposed in the same layer (for example, in thesecond conductive layer), and are made of the same material, as thefirst plate of the storage capacitor Cst. For example, the signalconnection lines to which the pixel driving circuits 10 in the 1^(st)and the M-th first sub-pixel driving circuit groups A10 are coupledinclude a metal, such as molybdenum or an alloy of molybdenum. Forexample, the signal connection lines may have the same material as thefirst conductive layer. The pixel driving circuits 10 in the 1^(st) andthe M-th first sub-pixel driving circuit groups A10 may be coupled tothe signal connection lines through via holes penetrating through theinsulating layer, and the signal connection lines are coupled to thelight emitting devices through via holes penetrating through theinsulating layer. The signal connection line coupled to each of thepixel driving circuits 10 in the 2^(nd) to the (M−1)-th first sub-pixeldriving circuit groups A10 includes a transparent conductive material,for example, indium tin oxide.

In some embodiments, the signal connection line coupled to each of thepixel driving circuits 10 in the 2^(nd) to the (M−1)-th first sub-pixeldriving circuit groups A10 may be disposed in the same layer and made ofthe same material as the first electrode D1 of the light emitting deviceD. For example, the first electrode of the light emitting device D is ananode. The pixel driving circuits 10 in the 2^(nd) to the (M−1)-th firstsub-pixel driving circuit groups A10 may be coupled to the signalconnection lines through via holes penetrating through the insulatinglayer, and the signal connection lines are directly coupled to the lightemitting devices.

In some embodiments, the first sub-pixel driving circuit groups A10located in the first and second sub-display regions Q11 and Q12 areuniformly arranged in the row direction X. For example, the first pixeldriving circuit group includes, in addition to the first sub-pixeldriving circuit group A10, a second sub-pixel driving circuit grouppositioned in the first sub-display region Q11 and the secondsub-display region Q12, and the number of the second sub-pixel drivingcircuit groups between two adjacent first sub-pixel driving circuitgroups A10 is the same.

In some embodiments, the number of first sub-pixel driving circuitgroups A10 in the first display region Q1 is greater than the number oflight emitting device groups A20 in the mounting region Q3, that is,some redundant pixel driving circuits 10 are present in the firstdisplay region Q1, so that repair can be performed when some pixeldriving circuits 10 fail.

In some embodiments, in order to satisfy the wiring space of the datalines Vd coupled to the first sub-pixel driving circuit group, bycompressing the pixel driving circuits 10 in the third and fourthsub-display regions Q13 and Q14 in the column direction Y to form atransition region Q4 between the first and second display regions Q1 andQ2 and surrounding the first display region Q1, the wiring space isreserved by the transition region Q4 for the data lines Vd coupled tothe first sub-pixel driving line group A10. The data line Vd is a bendline in the transition region Q4, i.e., the portion of the bend line ofthe first data line Vd-1 in the transition region Q4 shown in FIG. 7 .

In some embodiments, by compressing the pixel driving circuits 10 in thethird sub-display region Q13 and the fourth sub-display region Q14 inthe column direction Y, in the third sub-display region Q13 and thefourth sub-display region Q14, the distance between the reset powersignal lines to which two adjacent pixel driving circuits 10 are coupledin the column direction Y is d3; in the second display region Q2, thedistance between the reset power signal lines to which two adjacentpixel driving circuits 10 are coupled in the column direction Y is d4,and d3 is smaller than d4.

In some embodiments, in the first display region Q1, the width of atleast some pixel driving circuits 10 in the row direction X is smallerthan the width of at least some light emitting devices D in the rowdirection X. In an embodiment, the width of the pixel driving circuit 10in the row direction X is, for example, the distance between adjacentdata lines Vd, or the distance between respective positions of the samecomponents of two pixel driving circuits 10; the width of the lightemitting device D in the row direction X is, for example, the width ofthe first electrode D1 of the light emitting device D in the rowdirection X, the width of the light emitting layer of the light emittingdevice D in the row direction X, the width of the light emitting regionof the light emitting device D in the row direction X, or the width ofthe opening of the pixel defining layer of the light emitting device Din the row direction X, or the width of the light emitting device Dmeans one quarter of the distance between the light emitting devices ofthe same color in two light emitting units adjacently disposed in therow direction X.

For example, in a case where the width of the pixel driving circuits 10in the row direction X refers to the distance between respectivepositions of the same components of two pixel driving circuits 10, andthe width of the light emitting device D refers to one quarter of thedistance between the light emitting devices of the same color in twolight emitting units adjacently arranged in the X direction, in thefirst display region Q1, a difference between the width of any one pixeldriving circuit 10 in the row direction X and the width of any one ofthe light emitting devices D in the row direction X is about 3 to 5 μm.The height or width of the pixel driving circuit 10 is smaller than thewidth or height of the light emitting device D in the first displayregion Q1, and the height or width of the pixel driving circuit 10 isthe same as the width or height of the light emitting device D in thesecond display region Q2.

In some embodiments, since the photosensitive sensors are disposed inthe mounting region Q3, the size of the light emitting device D in themounting region Q3 is smaller than the size of the light emitting deviceD in each of the first display region Q1 and the second display regionQ2. For example, the size of the light emitting device D refers to thearea of the light emitting device D, such as the area of the anode, orthe area of the light emitting region. For example, the displaysubstrate further includes a pixel defining layer disposed on thesubstrate, the pixel defining layer includes pixel openings inone-to-one correspondence with the first electrodes D1 of the lightemitting devices D, and in each of the first display region Q1, thesecond display region Q2, and the mounting region Q3, the pixel openingscorresponding to the first electrodes D1 of the light emitting devices Demitting light with the same color have substantially the same size. Forthe pixel openings corresponding to the first electrodes D1 (forexample, anodes) of the light emitting devices D emitting light with thesame color, the size of the pixel opening in the mounting region Q3 issmaller than the size of the pixel opening in each of the first displayregion Q1 and the second display region Q2.

In the embodiments of the present disclosure, in order to make thestructures of the layers in the display substrate more apparent, thefollowing description will be given by explaining each patterned layerin the display substrate in detail with reference to the layout of thepatterned layer. For example, FIG. 14 is a schematic diagram of anactive semiconductor layer of a display substrate according to anembodiment of the disclosure. As shown in FIG. 14 , the activesemiconductor layer 010 may be formed by patterning the semiconductormaterial. The active semiconductor layer 010 may be used to fabricateactive layers of the driving transistor T3, the data writing transistorT4, the threshold compensation transistor T2, the first light emissioncontrol transistor T5, the second light emission control transistor T6,the first reset transistor T1, and the second reset transistor T7described above. The active semiconductor layer 010 includes a patternof an active layer (channel region) and a pattern of a doped region(source/drain doped region) of each transistor of each sub-pixel, andthe pattern of the active layer and the pattern of the doped region ofeach transistor in the same pixel driving circuit 10 are formed as asingle piece.

It should be noted that, the active semiconductor layer 010 is disposedon the substrate, a buffer layer is formed between the substrate and theactive semiconductor layer 010, the active layer may include a lowtemperature polysilicon layer that is formed as a single piece, and thesource region and the drain region may be conducted by doping to realizeelectric connection of respective structures. That is, the activesemiconductor layer 010 of each transistor of each pixel driving circuit10 is a single pattern formed of p-Si, and each transistor in the samepixel driving circuit 10 includes the pattern of the doped region (i.e.,a source region and a drain region) and the pattern of the active layer,and active layers of different transistors are separated by the dopedstructure.

For example, the active semiconductor layer 010 may be made of amorphoussilicon, polycrystalline silicon, an oxide semiconductor material, orthe like. It should be noted that, the source region and the drainregion may be regions doped with n-type impurities or p-type impurities.

For example, the active semiconductor layers 010 of the pixel drivingcircuits 10 arranged in the row direction X are disconnected from eachother. The active semiconductor layers 010 of the pixel driving circuits10 arranged in the column direction Y may be formed as a single piece ormay be disconnected from each other.

For example, a gate insulating layer is formed on the activesemiconductor layer 010. FIG. 15 is a schematic diagram of a firstconductive layer of a display substrate according to an embodiment ofthe disclosure. As shown in FIG. 15 , the display substrate includes afirst conductive layer 020, and the first conductive layer 020 isdisposed on a side of the gate insulating layer away from the activesemiconductor layer 010, so as to be insulated from the activesemiconductor layer 010. The first conductive layer 020 may include thesecond plate CC2 of the storage capacitor Cst, the scan signal line Ga,the reset control signal line Rst, the light emission control signalline EM, and the gate electrodes of the driving transistor T3, the datawriting transistor T4, the threshold compensation transistor T2, thefirst light emission control transistor T5, the second light emissioncontrol transistor T6, the first reset transistor T1, and the secondreset transistor T7.

For example, the gate electrode of the data writing transistor T4 may bea portion of the scan signal line Ga overlapping with the activesemiconductor layer 010; the gate electrode of the first light emissioncontrol transistor T5 may be a first portion of the light emissioncontrol signal line EM overlapping with the active semiconductor layer010, and the gate electrode of the second light emission controltransistor T6 may be a second portion of the light emission controlsignal line EM overlapping with the active semiconductor layer 010; thegate electrode of the first reset transistor T1 may be a first portionof the reset control signal line Rst overlapping with the activesemiconductor layer 010, and the gate electrode of the second resettransistor T7 may be a second portion of the reset control signal lineRst overlapping with the active semiconductor layer 010; the thresholdcompensation transistor T2 may be a thin film transistor having a dualgate structure, a first gate electrode of the threshold compensationtransistor T2 may be a portion of the scan signal line Ga overlappingwith the active semiconductor layer 010, and a second gate electrode ofthe threshold compensation transistor T2 may be a portion of aprotruding structure P, which protrudes from the scan signal line Ga,overlapping with the active semiconductor layer 010. The gate electrodeof the driving transistor T3 may serve as the second plate CC2 of thestorage capacitor Cst.

It should be noted that each dotted rectangular box in FIG. 14 showseach portion where the first conductive layer 020 overlaps with theactive semiconductor layer 010. The active semiconductor layers 010 atboth sides of a channel region of each transistor are conductized by aprocess of ion doping or the like to form source and drain electrodes ofthe transistor.

For example, as shown in FIG. 15 , the scan signal lines Ga, the resetcontrol signal lines Rst, and the light emission control signal lines EMare arranged in the column direction Y. The scan signal line Ga islocated between the reset control signal line Rst and the light emissioncontrol signal line EM.

For example, in the column direction Y, the second electrode CC2 of thestorage capacitor Cst (i.e., the gate electrode of the drivingtransistor T3) is located between the scan signal line Ga and the lightemission control signal line EM. The protruding structure P protrudingfrom the scan signal line Ga is located on a side of the scan signalline Ga away from the light emission control signal line EM.

For example, as shown in FIG. 14 , in the column direction Y, the gateelectrode of the first reset transistor T1, the gate electrode of thesecond reset transistor T7, the gate electrode of the data writingtransistor T4, and the gate electrode of the threshold compensationtransistor T2 are located on a first side of the gate electrode of thedriving transistor T3, and the gate electrodes of the first lightemission control transistor T5 and the second light emission controltransistor T6 are located on a second side of the gate electrode of thedriving transistor T3. For example, in the example shown in FIG. 12 ,the first side and the second side of the gate electrode of the drivingtransistor T3 of the pixel driving circuit 10 are two sides of the gateelectrode of the driving transistor T3 which are opposite to each otherin the second direction Y. For example, as shown in FIG. 14 , the firstside of the gate electrode of the driving transistor T3 of the pixeldriving circuit 10 may be the lower side of the gate electrode of thedriving transistor T3, and the second side of the gate electrode of thedriving transistor T3 of the pixel driving circuit 10 may be the upperside of the gate electrode of the driving transistor T3. For example,the side of the display substrate for bonding the IC is the lower sideof the display substrate, and the lower side of the gate electrode ofthe driving transistor T3 is the side of the gate electrode of thedriving transistor T3 closer to the IC. The upper side is an oppositeside of the lower side, for example, the upper side of the gateelectrode of the driving transistor T3 is a side of the gate electrodeof the driving transistor T3 away from the IC.

In some embodiments, as shown in FIG. 14 , in the row direction X, thegate electrode of the second light emission control transistor T6, thegate electrode of the second reset transistor T7, and the first gateelectrode of the threshold compensation transistor T2 are all located atthe third side of the gate electrode of the driving transistor T3; andthe gate electrode of the first light emission control transistor T5,the gate electrode of the data writing transistor T4, the gate electrodeof the first reset transistor T1 are all located at the fourth side ofthe gate electrode of the driving transistor T3. For example, in theexample shown in FIG. 14 , the third side and the fourth side of thegate electrode of the driving transistor T3 of the pixel driving circuit10 of the sub-pixel are two sides of the gate electrode of the drivingtransistor T3 which are opposite to each other in the row direction X.For example, as shown in FIG. 14 , the third side of the gate electrodeof the driving transistor T3 of the pixel driving circuit 10 may be theleft side of the gate electrode of the driving transistor T3 of thepixel driving circuit 10, and the fourth side of the gate electrode ofthe driving transistor T3 of the pixel driving circuit 10 may be theright side of the gate electrode of the driving transistor T3 of thepixel driving circuit 10. The left and right sides are opposite sides.For example, for the data line Vd and the first power signal line VDDcoupled to the same pixel driving circuit 10, the data line Vd is on theright side of the first power signal line VDD, and the first powersignal line VDD is on the left side of the data line Vd.

It should be noted that the structure of pixel driving circuit 10 may bea mirror-image structure as shown in FIG. 14 , that is, the structuresof the layers of each pixel driving circuit 10 are symmetric withrespect to the channel region of the driving transistor T3, andtherefore, the left and right sides of the structures of the layers ofeach pixel driving circuit 10 may be reversed.

For example, a first insulating layer is formed on the first conductivelayer 020 to insulate the first conductive layer 020 from a secondconductive layer 030 to be formed subsequently. FIG. 16 is a schematicdiagram of a second conductive layer 030 of a display substrateaccording to an embodiment of the disclosure. As shown in FIG. 16 , thesecond conductive layer 030 of the pixel driving circuit 10 includes afirst transfer electrode Vd-14 and a second transfer electrode Vd-15 ofthe first data line Vd-1, a signal connection line Vc-1 coupled to thepixel driving circuits 10 of the 1^(st) and the M-th first sub-pixeldriving circuit groups A10, a first plate CC1 of the storage capacitorCst, the reset power signal line Init, and a first light shieldingpattern S20. The first plate CC1 of the storage capacitor Cst at leastpartially overlaps with the second plate CC2 of the storage capacitorCst to form the storage capacitor Cst.

In some embodiments, as shown in FIG. 14 , the active semiconductorlayer 010 between two channel regions of the dual-gate thresholdcompensation transistor T2 is in a floating state when the thresholdcompensation transistor T2 is turned off, and a voltage of the activesemiconductor layer 010 is apt to jump by the influence of a voltage ona peripheral conductive line, so that the leakage current of thethreshold compensation transistor T2 is affected, and thus, thebrightness of the emitted light is affected. In order to keep thevoltage of the active semiconductor layer 010 between the two channelregions of the threshold compensation transistor T2 stable, the secondlight shielding pattern S20 and the active semiconductor layer 010between the two channel regions of the threshold compensation transistorT2 are disposed to form a capacitor, and the second light shieldingpattern S20 may be coupled to the first power signal line VDD to obtaina constant voltage, so that the voltage of the active semiconductorlayer 010 in a floating state may be kept stable. The second lightshielding pattern S20 overlaps with the active semiconductor layer 010between the two channel regions of the dual-gate threshold compensationtransistor T2, which may also prevent the active semiconductor layer 010between the two gate electrodes from being irradiated so as to avoid achange of its characteristics, for example, prevent the voltage of theactive semiconductor layer 010 from being changed so as to preventcrosstalk.

In one example, the first power signal line VDD to which each of thesecond light shielding patterns S20 is coupled is one of the pluralityof first power signal lines VDD that is closest thereto in the rowdirection X. For example, the second light shielding pattern S20 forshielding the channel region of the threshold compensation transistor T2in the second pixel driving circuit 10 is coupled to the first powersignal line VDD on the left side thereof, which is also used to supplythe first voltage to the first pixel driving circuit 10.

For example, a second insulating layer is formed on the secondconductive layer 030 described above to insulate the second conductivelayer 030 described above from a first source/drain metal layer to beformed subsequently. FIG. 17 is a schematic diagram of a thirdconductive layer 040 of a display substrate according to an embodimentof the disclosure. As shown in FIG. 17 , the first source-drain metallayer of the pixel driving circuit 10 includes a first sub data linesegment Vd-11, a second sub data line segment Vd-12, a third sub dataline segment Vd-13 and a first transfer portion S11 of a first data lineVd-1, a fourth sub data line segment Vd-16 and a fifth sub data linesegment Vd-17 of a second data line Vd-2, a first power signal line VDD,and a portion of the data line Vd that is only located in the firstdisplay region Q1.

For example, the third conductive layer further includes a firstconnection portion 11 and a second connection portion 12. FIG. 17 alsoillustrates an exemplary location of a plurality of via holes throughwhich the third conductive layer 040 is coupled to the plurality of filmlayers that are located between the source-drain metal layer and thesubstrate 101. For example, as shown in FIGS. 3 and 17 , the data lineVd is electrically coupled to the drain electrode of the data writingtransistor T4 through a via hole 210 penetrating through the gateinsulating layer, the first insulating layer, and the second insulatinglayer. The power signal line VDD is electrically coupled to the sourceelectrode of the first light emission control transistor T5 through avia hole 208 penetrating through the gate insulating layer, the firstinsulating layer, and the second insulating layer. The power signallines VDD and the data lines Vd are alternately arranged in the rowdirection X. The power signal line VDD is electrically coupled to thefirst plate CC1 of the storage capacitor through via holes 206 and 207penetrating through the second insulating layer. The first power signalline VDD extends in the column direction Y. The power signal line VDD iselectrically coupled to the second light shielding pattern S20 through avia hole 205 penetrating through the second insulating layer 105 tosupply a constant voltage to the second light shielding pattern S20. Oneend of the first connection portion 11 is electrically coupled to thereset power signal line Init through a via hole 208 penetrating throughthe first and second insulating layers, and the other end of the firstconnection portion 11 is electrically coupled to the drain electrode ofthe first transistor T1 and the source electrode of the seventhtransistor T7 through a via hole 202 penetrating through the interlayerinsulating layer, the first insulating layer, and the second insulatinglayer. One end of the second connection portion 12 is electricallycoupled to the source electrode of the first transistor T1 through a viahole 203 penetrating through the gate insulating layer, the firstinsulating layer, and the second insulating layer, and the other end ofthe second connection portion 12 is electrically coupled to the secondplate CC2 of the storage capacitor Cst through a via hole 204penetrating through the first insulating layer and the second insulatinglayer.

For example, a third insulating layer is formed on the third conductivelayer described above for insulating the third conductive layer 040 fromthe fourth conductive layer 050 which is formed subsequently. FIG. 18 isa schematic diagram of the fourth conductive layer 050 of the displaysubstrate according to an embodiment of the disclosure. As shown in FIG.18 , the fourth conductive layer 050 includes a first light shieldingportion S10 and a second transfer portion S12. The orthographicprojection of the first light shielding portion S10 on the substrate atleast partially overlaps with the orthographic projection of the activelayer of the driving transistor T3 on the substrate; and the secondtransfer portion S12 is electrically coupled to the first transferportion S11 through a via hole 209 penetrating through the thirdinsulating layer.

For example, a planarization layer is formed on the fourth conductivelayer 050 to protect the fourth conductive layer 050 described above. Afirst electrode D1 of the light emitting device D is formed on theplanarization layer 106, and the first electrode D1 of the lightemitting device D is coupled to the second transfer portion S12. FIG. 19is a schematic diagram of the first electrode (transparent conductivelayer 070) of the light emitting device of the display substrateaccording to an embodiment of the disclosure. As shown in FIG. 19 , theplanarization layer includes a via hole 211, the first electrode D1 ofeach light emitting device D may be disposed on a side of theplanarization layer away from the substrate, and the first electrode D1of the light emitting device D is electrically coupled to the drainelectrode of the second light emission control transistor T6 through thevia hole. Of course, it should be understood that a signal connectionline is further provided in the transparent conductive layer 070 forelectrically coupling the first electrode D1 of the light emittingdevice D in the mounting region and the drain electrode of the secondlight emission control transistor T6.

Continuing to refer to FIG. 19 , the sizes of the first electrodes D1(R)of the red light emitting devices in the first display region Q1 and themounting region Q3 are substantially the same, and the size of the firstelectrode D1(R) of the red light emitting device in the first displayregion Q1 is larger than the size of the first electrode D1(R) of thered light emitting device in the mounting region Q3; the sizes of thefirst electrodes D1(B) of the green light emitting devices in the firstdisplay region Q1 and the mounting region Q3 are substantially the same,and the size of the first electrode D1(B) of the green light emittingdevice in the first display region Q1 is larger than the size of thefirst electrode D1(B) of the green light emitting device in the mountingregion Q3.

In some embodiments, the light emitting device D may be an organic lightemitting diode (OLED), or may also be an LED, and in the embodiments ofthe present disclosure, the description is given by taking a case wherethe light emitting device D is the OLED as an example. One of the firstelectrode D1 and the second electrode of the light emitting device D isan anode, and the other is a cathode.

An embodiment of the present disclosure also provides a display device,which includes the display substrate. It should be noted that, thedisplay device provided in the embodiment may be any product orcomponent with a display function, such as a flexible wearable device, amobile phone, a tablet computer, a television, a display, a notebookcomputer, a digital photo frame, a navigator and the like. Otheressential components of the display device should be understood by thoseof ordinary skill in the art, and are not described herein, and shouldnot be construed as limiting the disclosure.

In some embodiments, the display device further includes: aphotosensitive sensor, of which an orthographic projection on thesubstrate is located in the mounting region Q3. The mounting region Q3is rectangular, and the area of the orthographic projection of thephotosensitive sensor on the substrate is less than or equal to the areaof the inscribed circle of the second display region Q2.

Further, the display device may also include various types of displaydevices, such as a liquid crystal display device, an organic lightemitting (OLED) display device, and a tiny diode (mini LED) displaydevice, which are not limited herein.

It could be understood that the above embodiments are merely exemplaryembodiments adopted for describing the principle of the presentdisclosure, but the present disclosure is not limited thereto. Variousvariations and improvements may be made by those of ordinary skill inthe art without departing from the spirit and essence of the presentdisclosure, and these variations and improvements shall also be regardedas falling into the protection scope of the present disclosure.

What is claimed is:
 1. A display substrate having a mounting region, afirst display region adjacent to the mounting region, and a seconddisplay region surrounding the first display region and/or the mountingregion, the display substrate comprising: a substrate; a driving circuitlayer on the substrate and comprising a plurality of pixel drivingcircuits, the plurality of pixel driving circuits being in the firstdisplay region and the second display region, and an arrangement densityof the pixel driving circuits in the second display region being lessthan that of the pixel driving circuits in the first display region; aplurality of light emitting devices in the mounting region, the firstdisplay region, and the second display region, a first electrode of eachlight emitting device being electrically coupled to a corresponding oneof the pixel driving circuits, and the pixel driving circuitelectrically coupled to the first electrode of the light emitting devicein the mounting region being located in the first display region; and aplurality of data lines in the first display region and the seconddisplay region, each pixel driving circuit being electrically coupled toa corresponding one of the data lines, wherein at least part of theplurality of data lines includes a bend line, wherein at least one ofthe data lines which is the bend line is a first data line; the firstdata line comprises a first sub data line segment directly coupled tothe pixel driving circuit for driving at least part of the lightemitting devices in the mounting region, and a second sub data linesegment directly coupled to the pixel driving circuit for driving atleast part of the light emitting devices in the second display region;and the first sub data line segment and the second sub data line segmentare at least partially not on a same straight line.
 2. The displaysubstrate of claim 1, wherein in the first display region, a distancebetween nodes at which two pixel driving circuits adjacent in a firstdirection are respectively coupled to corresponding data lines is d1; inthe second display region, a distance between nodes at which two pixeldriving circuits adjacent in the first direction are respectivelycoupled to corresponding data lines is d2; and d1 is less than d2. 3.The display substrate of claim 2, wherein the plurality of lightemitting devices comprises a plurality of light emitting device groupsarranged along the first direction, the light emitting devices in eachof the plurality of light emitting device groups are arranged along asecond direction; and the pixel driving circuits coupled to the firstelectrodes of the light emitting devices in a same light emitting devicegroup are coupled to a same data line.
 4. The display substrate of claim2, wherein at least part of the plurality of data lines comprisesportions in different layers.
 5. The display substrate of claim 1,wherein the first data line further comprises a third sub data linesegment directly coupled to the pixel driving circuit for driving atleast part of the light emitting devices in the first display region;and at least portions of the first sub data line segment and the thirdsub data line segment are not on a same straight line.
 6. The displaysubstrate of claim 5, wherein the first and second sub data linesegments comprise different materials, and/or the first and third subdata line segments comprise different materials.
 7. The displaysubstrate of claim 5, wherein the second sub data line segment comprisesa first portion and a second portion respectively at two opposite sidesof the mounting region along a second direction; the first data linefurther comprises a first transfer electrode and a second transferelectrode respectively arranged at the two opposite sides of themounting region along the second direction, and the first sub data linesegment is electrically coupled, on a first side of the mounting regionalong the second direction, to the first portion of the second sub dataline segment through the first transfer electrode; and the first subdata line segment is electrically coupled, on a second side of themounting region along the second direction, to the second portion of thesecond sub data line segment through the second transfer electrode. 8.The display substrate of claim 7, wherein the first and second transferelectrodes comprise portions which are substantially in parallel witheach other; a length of at least part of the first transfer electrodealong the first direction is substantially the same as a length of atleast part of the second transfer electrode along the first direction,and the display substrate further comprises a second conductive layer onthe substrate and comprising the first and second transfer electrodesextending in the first direction; a second insulating layer on a side ofthe second conductive layer away from the substrate; a third conductivelayer on a side of the second insulating layer away from the secondconductive layer, and comprising the first sub data line segment, thesecond sub data line segment, and the third sub data line segmentextending along the second direction.
 9. The display substrate of claim1, wherein the first sub data line segment comprises a portion that issubstantially in parallel with the second and third sub data linesegments.
 10. The display substrate of claim 1, further comprising atransition region surrounding the first display region and locatedbetween the first display region and the second display region, whereinthe plurality of light emitting devices comprise a light emitting devicein the transition region and a pixel driving circuit to which a firstelectrode of the light emitting device in the transition region iscoupled is in the first display region.
 11. The display substrate ofclaim 1, wherein among the light emitting devices in the mountingregion, the first display region, and the second display region, thepixel driving circuits for the light emitting devices in a same regionand arranged in a second direction are arranged in the second direction.12. The display substrate of claim 1, wherein a ratio of an area of apattern of an active semiconductor layer in the first display region toan area of the first display region is larger than a ratio of an area ofa pattern of an active semiconductor layer in the second display regionto an area of the second display region.
 13. The display substrate ofclaim 1, wherein ratios of respective light emission areas of at leasttwo of the first display region, the second display region, and themounting region to respective total areas of the at least two of thefirst display region, the second display region, and the mounting regionare different from each other.
 14. The display substrate of claim 1,wherein in the first display region, a width of the pixel drivingcircuit in a first direction is less than a width of the light emittingdevice in the first direction, wherein in the first display region, adifference between a width of the pixel driving circuit in the firstdirection and a width of any one of the plurality of light emittingdevices in the first direction is about 3 μm to about 5 μm.
 15. Adisplay device, comprising the display substrate of claim 1, wherein thedisplay device further comprises: a photosensitive sensor, wherein anorthographic projection of the photosensitive sensor on the substrate isin the mounting region, and wherein the mounting region is rectangular,and an area of the orthographic projection of the photosensitive sensoron the substrate is equal to or smaller than an area of an inscribedcircle of the second display region.
 16. The display substrate of claim1, wherein the first display region comprises a first sub display regionand a second sub display region which are oppositely arranged in thefirst direction; the first sub-pixel driving circuit groups are arrangedin the first sub-display region and the second sub-display region; and aratio of the closest distance from at least one first sub-pixel drivingcircuit group in the first sub-display region to an edge of the mountingregion, to the closest distance from at least one first sub-pixeldriving circuit group in the second sub-display region to an edge of themounting region ranges from 0.8 to 1.2, wherein a 1st to an M-th lightemitting device groups are sequentially arranged in a direction from thefirst sub display region towards the second sub display region; a 1st toan (M/2)-th first sub-pixel driving circuit groups are in the firstsub-display region and are sequentially arranged in the first directionalong a direction away from the mounting region; an M-th to an(M/2+1)-th first sub-pixel driving circuit groups are in the secondsub-display region and are sequentially arranged in the first directionalong the direction away from the mounting region, and wherein thedisplay substrate further comprises: a second conductive layer on thesubstrate, wherein the second conductive layer comprises a reset powersignal line, a first plate of a storage capacitor and the signalconnection lines correspondingly coupled to the pixel driving circuitsin the 1st and M-th first sub-pixel driving circuit groups.
 17. Adisplay substrate having a mounting region, a first display regionadjacent to the mounting region, and a second display region surroundingthe first display region and/or the mounting region, the displaysubstrate comprising: a substrate; a driving circuit layer on thesubstrate and comprising a plurality of pixel driving circuits, theplurality of pixel driving circuits being in the first display regionand the second display region, and an arrangement density of the pixeldriving circuits in the second display region being less than that ofthe pixel driving circuits in the first display region; and a pluralityof light emitting devices in the mounting region, the first displayregion, and the second display region, a first electrode of each lightemitting device being electrically coupled to a corresponding one of thepixel driving circuits, and the pixel driving circuit electricallycoupled to the first electrode of the light emitting device in themounting region being located in the first display region; wherein thepixel driving circuits in the first display region comprises a pluralityof first pixel driving circuit groups arranged in a first direction; thepixel driving circuits in the second display region comprises aplurality of second pixel driving circuit groups arranged along thefirst direction; the plurality of first pixel driving circuit groupseach comprise a plurality of first pixel driving circuits arranged in asecond direction, and the plurality of second pixel driving circuitgroups each comprise a plurality of first pixel driving circuitsarranged in the second direction; the plurality of light emittingdevices constitute a plurality of light emitting device groups arrangedin the first direction, and the light emitting devices in each of theplurality of light emitting device groups are arranged in the seconddirection; and the plurality of light emitting device groups comprise Mmounting-region light emitting device groups, at least one lightemitting device of each mounting-region light emitting device groupbeing in the mounting region; the plurality of first pixel drivingcircuit groups comprise M first sub-pixel driving circuit groups, thepixel driving circuits in each of the M first sub-pixel driving circuitgroups are arranged along the second direction; and M is an integergreater than or equal to 2; and the first electrodes of the lightemitting devices of an i-th mounting-region light emitting device groupin the mounting region are coupled to the pixel driving circuits in ani-th first sub-pixel driving circuit group in a one-to-onecorrespondence by signal connection lines, and i has a value from 1 toM.
 18. The display substrate of claim 17, further comprising: an activesemiconductor layer, comprising a channel region and a source/draindoped region of each transistor of each of the plurality of pixeldriving circuits, the plurality of pixel driving circuit each at leastcomprising a driving transistor, a data writing transistor, a storagecapacitor, a threshold compensation transistor, a first resettransistor, a second reset transistor, a first light emission controltransistor and a second light emission control transistor; a gateinsulating layer on a side of the active semiconductor layer away fromthe substrate; a first conductive layer on a side of the gate insulatinglayer away from the active semiconductor layer, the first conductivelayer comprising a second plate of the storage capacitor, a scan signalline, a reset control signal line, a light emission control signal line,and control electrodes of the driving transistor, the data writingtransistor, the threshold compensation transistor, the first lightemission control transistor, the second light emission controltransistor, the first reset transistor, and the second reset transistor,the control electrode of the driving transistor being reused as thesecond plate of the storage capacitor; a first insulating layer on aside of the first conductive layer away from the gate insulating layer,the second conductive layer being on a side of the first insulatinglayer away from the first conductive layer; a second insulating layer ona side of the second conductive layer away from the first insulatinglayer; and a third conductive layer on a side of the second insulatinglayer away from the second conductive layer, the third conductive layercomprising a first power signal line, at least part of data lines and afirst sub-transfer part; the first sub-transfer part being electricallycoupled to a second electrode of the second light emission controltransistor.
 19. The display substrate of claim 17, wherein the firstdisplay region further comprises a third sub-display region and a fourthsub-display region oppositely disposed in the second direction; in thethird sub-display region and the fourth sub-display region, a distancebetween reset control signal lines to which two adjacent pixel drivingcircuits in the second direction are coupled is d3; in the seconddisplay region, a distance between reset power supply signal lines towhich two adjacent pixel driving circuits in the second direction arecoupled is d4, and d3 is smaller than d4, wherein the display substratefurther comprises: a transparent conductive layer, at least comprisingthe first electrode of the light emitting device in the mounting region,and the signal connection lines correspondingly coupled to the pixeldriving circuits in at least some first sub-pixel driving circuit groupsamong a 2nd to an (M−1)-th first sub-pixel driving circuit groups,wherein the first sub-pixel driving circuit groups are uniformlyarranged along the first direction in the first sub-display region andthe second sub-display region.
 20. A display substrate having a mountingregion, a first display region adjacent to the mounting region, and asecond display region surrounding the first display region and/or themounting region, the display substrate comprising: a substrate; adriving circuit layer on the substrate and comprising a plurality ofpixel driving circuits, the plurality of pixel driving circuits being inthe first display region and the second display region, and anarrangement density of the pixel driving circuits in the second displayregion being less than that of the pixel driving circuits in the firstdisplay region; and a plurality of light emitting devices in themounting region, the first display region, and the second displayregion, a first electrode of each light emitting device beingelectrically coupled to a corresponding one of the pixel drivingcircuits, and the pixel driving circuit electrically coupled to thefirst electrode of the light emitting device in the mounting regionbeing located in the first display region, wherein the display substratefurther comprises a pixel defining layer on the substrate, the pixeldefining layer comprising pixel openings in one-to-one correspondencewith the first electrodes of the plurality of light emitting devices; inthe first display region, sizes of the pixel openings corresponding tothe first electrodes of the light emitting devices emitting light with asame color are substantially the same, in the second display region,sizes of the pixel openings corresponding to the first electrodes of thelight emitting devices emitting light with a same color aresubstantially the same, and in the mounting region, sizes of the pixelopenings corresponding to the first electrodes of the light emittingdevices emitting light with a same color are substantially the same; andamong the pixel openings corresponding to the first electrodes of thelight emitting devices emitting light with the same color, the size ofeach pixel opening in the mounting region is not larger than the sizesof the pixel openings in the first display region and the second displayregion.